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Probably an error! Should create a ticket for that. What would we want the behavior to be?

(This hasn't come up with existing customers because theoretically it could and we should handle it.)

maybe double the underscore on conflict?

some_key =1

some__key = 2

The convention when flattening is exactly that I thought - an underscore per level of nesting. This is what I would expect to see too.

Agree. (What if the original users key has the double underscore?) maybe this can be defined as a param?

> What if the original users key has the double underscore?

Double it again.

some_key = 1

some__key = 2

some____key = 3

This is analogous to what C#11 does to allow raw string literal quotes containing those same quotes. https://learn.microsoft.com/en-us/dotnet/csharp/language-ref...

escape the underscore. this is the only sane one, I think.